What Am I Riddles

Question: I drape the hills in white,
I do not swallow, but I do bite.

What am I?

Question: What runs around the house but doesn't move?

Question: What grows up and down at the same time?

Question: What has ten letters and starts with gas?

Question: It's hard to give up.Remove part of it and you still have a bit.Remove another part, but bit is still there.Remove another and it remains.What is it?